More US babies with Zika-related birth defects: CDC

A mother holds her 45-day-old daughter, who is suffering from microcephalia caught through an Aedes aegypti mosquito bite, at a hospital in Salvador, Brazil on January 27, 2016 (AFP Photo/Christophe Simon)

Three more babies have been born in the United States with birth defects likely linked to Zika virus infections, while another lost pregnancy was linked to the virus, according to figures updated by health officials on Thursday.

That brings the U.S. totals, as of June 23, to seven babies with microcephaly or other Zika-related birth defects such as serious brain abnormalities, and five lost pregnancies from either miscarriage, stillbirth or termination.

The figures were listed in a U.S. Zika pregnancy registry created earlier this month by the Centers for Disease Control and Prevention.

The registry compiles poor outcomes of pregnancies with laboratory evidence of possible Zika virus infection in the 50 states and the District of Columbia. The agency is currently monitoring 265 pregnant women with laboratory evidence of Zika infection, not including those in U.S. territories such as Puerto Rico.

Zika has caused concern throughout the Americas due to an alarming rise in cases of the birth defect known as microcephaly and other severe fetal brain abnormalities linked to the mosquito-borne virus reported in Brazil, the country hardest hit by the current outbreak. Infants with microcephaly tend to have abnormally small heads and may experience potentially disabling developmental problems.

Brazil has confirmed more than 1,400 cases of microcephaly in babies whose mothers were infected with Zika during pregnancy in the current outbreak.

More than 900 U.S. Zika cases reported so far have all involved people who contracted the virus outside the United States in areas with active Zika outbreaks, or were infected through unprotected sex with an infected partner.

There have not yet been any cases reported of local transmission of the virus in the United States, but health experts expect local transmission to occur with the onset of mosquito season, especially in Gulf Coast states, such as Florida and Texas.

The CDC plans to issue updated reports each Thursday to ensure that information about pregnancy outcomes linked with the Zika virus is publicly available.